Too stupid to understand, "If you can't do the time, don't do the crime"?
The comparison to troops was to point out that if the troops are routinely exposed to those conditions, and maintain their morale, then it can hardly be called "cruel and unusal punishment". That's what's in the Constitutions of both the US and of Arizona, and those are my standard.
Prisoners of course do not need the amount of calories or of water that active troops do, but they need enough water to replace what they lose. If the porta potties (or whatever arrangement they have) aren't being used, then they aren't getting enough water.
See my #152 in reply to TKDietz--it applies to your comment.